Deborah Arnott, chief executive of ASH, said: 'The number of ex-smokers who are staying off tobacco by using electronic cigarettes is growing, showing just what value they can have.
'But the number of people who wrongly believe that vaping is as harmful as smoking is worrying.
Dr Nick Hopkinson, Honorary Medical Adviser to the British Lung Foundation, said: 'Smoking-related diseases kill 100,000 people in the UK every year.
'E-cigarettes are certainly far less harmful than normal cigarettes, so if people can switch completely from smoking tobacco to e-cigarettes that will be an important step to improve their health.
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